How can I make Notepad++ actually start maximized?

When I start a new instance of Notepad++, its window is always slightly larger than the screen, not actually maximized. That really bothers me because I have two monitors, and the extra size spills over onto the second, an effect which looks really strange.

I looked through the settings dialogs and found nothing relevant. I found guides online that explain how to make a desktop shortcut create a maximized window, but I virtually always start Notepad++ via a context menu, so that tweak doesn't help.

I'm ruing the installed version of Notepad++ v6.3 on 64-bit Windows 8.1.

How can I make Notepad++ start with an actually maximized window?